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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Marketable Securities | The Company’s marketable securities consist of both trading (including securities held by a broker-dealer affiliate) and available-for-sale securities. The composition of the Company’s marketable securities is summarized as follows:
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Cost |  |  | Unrealized Loss |  |  | Unrealized Gain |  |  | Fair Value |
($ in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Trading: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsored mutual funds and variable insurance funds |  | $ | 7,312 |  |  | $ | (689 | ) |  | $ | 1,390 |  |  | $ | 8,013 |
Investments of consolidated sponsored investment products |  |  | 41,367 |  |  |  | (165 | ) |  |  | 2,025 |  |  |  | 43,227 |
Equity securities |  |  | 3,739 |  |  |  | — |  |  |  | 640 |  |  |  | 4,379 |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsored closed-end funds |  |  | 2,619 |  |  |  | (37 | ) |  |  | 74 |  |  |  | 2,656 |
Total marketable securities |  | $ | 55,037 |  |  | $ | (891 | ) |  | $ | 4,129 |  |  | $ | 58,275 |
December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Cost |  |  | Unrealized Loss |  |  | Unrealized Gain |  |  | Fair Value |
($ in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Trading: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsored mutual funds and variable insurance funds |  | $ | 9,195 |  |  | $ | (1,263 | ) |  | $ | 1,048 |  |  | $ | 8,980 |
Equity securities |  |  | 3,434 |  |  |  | (3 | ) |  |  | 115 |  |  |  | 3,546 |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsored closed-end funds |  |  | 2,240 |  |  |  | (38 | ) |  |  | 267 |  |  |  | 2,469 |
Total marketable securities |  | $ | 14,869 |  |  | $ | (1,304 | ) |  | $ | 1,430 |  |  | $ | 14,995

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- Definition Schedule Of Marketable Securities Table [Text Block] + References No definition available. + Details
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